from flask import abort, jsonify
from flask import current_app
from flask import g
from flask import render_template
from flask import request
from flask import session

from info import constants, db
from info.commom import user_login_data
from info.models import News, User, Comment, CommentLike
from info.modules.news import news_blu
from info.utils.response_code import RET


@news_blu.route('/comment_like', methods=["POST"])
@user_login_data
def comment_like():
    """
    评论点赞
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")

    # 1. 取到请求参数
    comment_id = request.json.get("comment_id")
    action = request.json.get("action")

    # 2. 判断参数
    if not all([comment_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    if action not in ["add", "remove"]:
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        comment_id = int(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 3. 获取到要被点赞的评论模型
    try:
        comment = Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    if not comment:
        return jsonify(errno=RET.NODATA, errmsg="评论不存在")

    if action == "add":
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
                                                      CommentLike.comment_id == comment.id).first()
        if not comment_like_model:
            # 点赞评论
            comment_like_model = CommentLike()
            comment_like_model.user_id = user.id
            comment_like_model.comment_id = comment.id
            db.session.add(comment_like_model)
            # 更新点赞次数
            comment.like_count += 1
    else:
        # 取消点赞评论
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
                                                      CommentLike.comment_id == comment.id).first()
        if comment_like_model:
            db.session.delete(comment_like_model)
            # 更新点赞次数
            comment.like_count -= 1

    try:
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据库操作失败")

    return jsonify(errno=RET.OK, errmsg="OK")

@news_blu.route('/news_comment', methods=['POST'])
@user_login_data
def comment_news():
    """
    评论新闻或者回复指定新闻下的评论内容
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg='用户未登录')

    # 获取参数
    news_id = request.json.get("news_id")
    comment_content = request.json.get("comment")
    parent_id = request.json.get("parent_id")

    # 2.判断参数
    if not all([news_id, comment_content]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    try:
        news_id = int(news_id)
        if parent_id:
            parent_id = int(parent_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    # 3.查询新闻，并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据查询错误')

    if not news:
        return jsonify(errno=RET.NODATA, errmsg='未查询到新闻数据')
    # 4.初始化评论模型并赋值
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_content
    if parent_id:
        comment.parent_id = parent_id

    # 5.添加到数据库
    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()
    return jsonify(errno=RET.OK, errmsg='OK', data=comment.to_dict())

@news_blu.route('/news_collect', methods=['POST'])
@user_login_data
def collect_news():
    """
    收藏新闻
    １．获取参数
    ２．判断参数
    :return:
    """

    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg='用户未登录')

    # １．获取参数
    news_id = request.json.get("news_id")
    action = request.json.get("action")
    # ２．判断参数
    if not all([news_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    if action not in ["collect", "cancel_collect"]:
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    try:
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    # 3.查询新闻，并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据查询错误')

    if not news:
        return jsonify(errno=RET.NODATA, errmsg='未查询到新闻数据')

    # 收藏以及取消收藏
    if action == 'cancel_collect':
        # 取消收藏
        if news in user.collection_news:
            user.collection_news.remove(news)
    else:
        # 4.收藏
        if news not in user.collection_news:
            # 添加到用户的收藏列表
            user.collection_news.append(news)

    return jsonify(errno=RET.OK, errmsg='操作成功')

@news_blu.route('/<int:news_id>')
@user_login_data
def news_detail(news_id):
    """
    新闻详情
    :param:news_id
    :return:
    """
    # 查询用户登录信息
    # user_id = session.get('user_id', None)
    # user = None
    # if user_id:
    #     try:
    #         user = User.query.get(user_id)
    #     except Exception as f:
    #         current_app.logger.error(f)
    user = g.user

    # 右侧新闻排行逻辑
    news_list = []
    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as f:
        current_app.logger.error(f)
    # 定义一个空的字典列表。里面装的时字典
    news_dict_li = []
    # 遍历对象的列表，把对象的字典添加到字典列表中
    for news in news_list:
        news_dict_li.append(news.to_basic_dict())

    # 查询新闻数据
    news = None
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
    if not news:
        abort(404)

    # 更新新闻的点击次数
    news.clicks += 1

    is_collected = False

    # if 判断用户是否登录
    #     判断用户是否收藏当前新闻，如果收藏
    #     is_collected = True
    if user:
        # 判断用户是否收藏当前新闻，如果收藏
        # collection_news后面可以不用加all，因为sqlalchemy会在用的时候自动加载
        if news in user.collection_news:
            is_collected = True

    # 查询评论的数据
    comments = []
    try:
        comments = Comment.query.filter(Comment.news_id == news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)

    # 需求：查询当前用户在当前新闻里面都点赞了哪些评论
    comment_like_ids = []
    if user:
        try:
            # 1.查询出当前新闻的所有评论
            comment_ids = [comment.id for comment in comments]
            # 2.查询当前评论中哪些评论被当前用户所点赞，查询comment_id在第一步的评论id列表内的所有数据 & commentlike.user_i=g.user.id
            comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids),
                                                     CommentLike.user_id == g.user.id).all()
            # 3.取到被点赞的评论id 第二步查询出来是一个［commentlike]列表
            comment_like_ids = [comment_like.comment_id for comment_like in comment_likes]
        except Exception as e:
            current_app.logger.error(e)

    comment_dict_li = []
    for comment in comments:
        comment_dict = comment.to_dict()
        # 代表没有点赞
        comment_dict['is_like'] = False
        # 遍历当前评论是否被当前用户所点赞
        if comment.id in comment_like_ids:
            comment_dict['is_like'] = True
        comment_dict_li.append(comment_dict)

    data = {
        "user": user.to_dict() if user else None,
        "news_dict_li": news_dict_li,
        "news": news.to_dict(),
        "is_collected": is_collected,
        "comments": comment_dict_li
    }
    return render_template("news/detail.html", data=data)
